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FDP Forum / Amp Mods, Repairs, and Projects / Vibrato "bug"-Polarity?

Rinto
Contributing Member
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Calif. Foothills

May 10th, 2012 08:30 AM Edit Profile Print Topic Search Topic
I ordered an LDR-optocoupler-bug from AES for a Super Reverb that was missing one; apparently someone previously had removed it. Is there a way to identify which "leg" goes to the 4 connecting points? I know the light faces toward the back of the chassis, but I'm unsure of the correct alignment of the legs....Is there only one correct way to hook it up, i.e. a polarity?? Perhaps it will come labeled as to which is which, not sure....Any help appreciated. Thanx, Rinto

Roly
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Whitehorse Canada

I don't get out much
May 10th, 2012 12:48 PM Edit Profile Print Topic Search Topic
One end should be flaged with a dot.
The leads on the dot end connect to the 10 meg and 100k resistors.

Liquid Smoke

USA

May 10th, 2012 05:14 PM Edit Profile Print Topic Search Topic
The chassis layout drawings at Schematic Heaven shows it very clearly too.

Rinto
Contributing Member
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Calif. Foothills

May 11th, 2012 12:15 AM Edit Profile Print Topic Search Topic
Thanks guys, I looked at the schematic, seems simple....Apparently there's no such thing as upside down (?).

Hammond101
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So. Cal. USA

May 11th, 2012 11:08 AM Edit Profile Print Topic Search Topic
The dot goes up and faces the preamp tube side of the chassis.
Bug in Deluxe Reverb
(This message was last edited by Hammond101 at 05:26 PM, May 11th, 2012)

Hammond101
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So. Cal. USA

May 11th, 2012 05:29 PM Edit Profile Print Topic Search Topic
Note,

If the bug has an LED in there it will be polarity senstive and not light if the polarity is reversed.

I added a pic to the above post.

Rinto
Contributing Member
*****

Calif. Foothills

May 12th, 2012 10:14 AM Edit Profile Print Topic Search Topic
Thanx for the clarification H101, it should be a breeze to add the bug....By the way, beautiful job on the Deluxe Reverb; is the chassis original and rebuilt with new components??

FDP Forum / Amp Mods, Repairs, and Projects / Vibrato "bug"-Polarity?

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